Cover construction for storage battery cells



July 15, 1952 REPPERT 2,603,672

COVER CONSTRUCTJEON FOR STORAGE BATTERY CELLS Filed fiOV. 4, 1949 2 44 a as 46 a1 44 I Zia a7 36 INVENTOR.

JYa/aml flew Mr! HTTORNEX July 15, 1952 R. REPPERT 3, 7

COVER CONSTRUCTION FOR STORAGE BATTERY CELLS Filed NOV. 4, 1949 2 SHEETS-SHEET 2 Wilk- 55 I 92 i 1 NVENTOR. 91v i' if fi'a/aud Few m"! Patented July 15, 1952 UNITED stru s, PATENTIQOFFICE COVER CONSTRUCTION FORISTORAGE v BATTERY CELLS p I V N. .Y., a corporatioirof NewYork v H e 1 r I 1 Applic'atidnNoviamber 4, 1949, Serial No. 125,592. 16 claims; (011136- 177 a 1 .The present invention relates, to a cover construction for a storage battery cell and more particularly to an improved type of cover construction including a cap means which may be suitably secured in a recess in thecover of a storage batterycell to close a filling opening for the cell and-Which may be moved to one side when de sired -to permit the filling of the cell, while;preventing bodily removal of theicap means suchas might intail'the loss thereof. Incidentvto; these features, the cover construction is proyided with an on overfilling arrangement -in a morepr less conventional manner and with a valvemeans; permitting the normal venting of gases from the cell during the ordinaryoperation ofthe battery and while the cap means associated with the cover isin its closed position.

a Among the objects of the present invention are to provide a cover and anl associated means for astorage batterycell having the following feature's: g

. 1. The cap means should be tightly seated upon the cover' during the normal operation of the battery to prevent'leakage of battery electrolyte therethrough; f I

, fThe' 'cap means is so arranged that it clllflbt be 'poqnyremoveamm theieover-incident to filling thebatterycellf H '13. A. on-overfill arrangement is provided eluding a'filling openingithrough whichwater or electrolyte may be added, but the additionbeing nmaeaso thatthe level of the electrolyte in the battery'may not be raised beyond a desired 1 6 21 i I i i thqsa lk mmi b t u i rinalop rar tion and W911? he seam -1 is i s closed v. 5. areprovided-forclosing off the nor-,

1am venting, so as to enable'the proper operation 101 v e n n-cve s urin f hel ime t the pegmean i w -t te e o th fil i f q t e the fil ine'o t hatt ry and p r i a V 6. Means are provided-to prevent theelosihg 5 l :of theficapi means by movement to its normally closed-position from displacing liquid which may have been; filled; up to the top of the reentrant seat inwhich the cap means is locatedat' its closed position, particularly by arranging that Further'objects of the present inventionin- I a Roland Iteppern; Pelham Manor, N 1 'assignor 'to American Hard Rubber Company, New York,

v in" Figs. '1 to3 inclusive; there is illustrated a volve the provision of various types" of mecha} nisms, which will accomplish the above outlined u a. y

In summary, the invention comprises apparatus having all the several functions above enu; merated in apractical type construction;

Qther and more detailed objects of the present invention will become apparent from the follow ing spec cationand appended claims, all, when considered with the accompanyingdrawings ,.,iii Figure' l is a fragment'ary view substantially in central, vertical 'se ction showingone embOdi-Q ment' of v the invention, and particularly illus-j trating a portionlof a storage batteryrcell cover. and a cap means in its closed'positionin association therewith; a Y V a Fig. 2 is a view of the apparatus of Fig-1; principally plan, but withparts broken. away to show the interior construction; I I "Fig. 3 is a View similar to Fig. l but with 'the cap meansswung to its open or battery cell fillingpositiomf Fig". 4 "isf a". View generally similar to Fig. "1 showing a second embodiment of the invention;

Fig. 5' is" a bottom plan view'of the embodiment of the invention shown in Fig. 4;

Fig; 671 s at'op'pla'n view, with are Brok 'awayand in section similar to'Fig. 2 ,of'a third embodiment ofthe invention; V .Fig. "I i'sIjajviewJsimilar'to Fig.1 showing the embodimentfof ,Fig. 6' in siibstantially' vertical secti'o1i ontliline1- 1 thereof; Fig; sis a view" insubstantiany verticalsection similar toQFi'gl 1,showing"a fourth andpreferred embodiment of theinventiony j Fig. 9} isan'inyerte'd; horizontal sectional View taken substantially on'the line 9'9.of Fig.

Fig 10v is a fragmentary view in substantially vertical section similar to 'Fig 'l of mnembodiment of. the invention, the-view being taken substantiallyon the line I 0-}.1 Ojof Fig.1'1'l and Fig. '11 is a. viewsiibstalitially horizontal eeition onthg linel,I'-}llfofFiglOi Re ferring'first to' the form or invention (shown battery cell cover, which maybe madeint a" stantially conventional. manner, and. of convene ti onal materials. In this connection the only requirements, as to the materials 'to be; used in constructing any of the parts of'the devices dis- :closedlin' this case is that they be'laeidf-res'is'tant or resistant against such" other chemicals as are used as the electrolytein the storage battery cell, and that theyhave the necessary physical 'ceptions 'hereinabove noted; the "present'inive j part3 means'inot-shown) properties, particularly mechanical strength, and

' in some instances a certain amount of resilience,

so as'to make the parts reasonably strong and permanent in use. It has been found, for, example; that hard rubber compositions are admirably suited for this purpose. It has also been 7 found that some-of the synthetic organic plastic materials; such as polystyrene, are suitable;*particularly for the construction of the cap means. Thesetypes of material specifically mentioned and other similar materials, are particularly favored as they may be molded into the desired;

' forms without requiring much, if any,

machining following the molding operation: With the tion is not restricted by or in any wayrelated is provided with one or more lateral projections to the compositiontof the materials llSdilrf A cover 20 is provided in a substantially coninovalf'o "t In the form of the invention of Figs. 1 to 3 the lower part of the :cap means 23, and particularly the part 3;] thereof, is provided with a downwardly extending'stem 34,.which is arranged to extend through a substantially circular bearing formed by a substantially annular flange 1 3 5 I depending frbi lh" cover 20.

thestem 34 is bifurcated, as shown at 36,and

or toes 37, only one being shown in this form 0 nven-tion; 'Inpractice the toe or projecvesto zprevent undesired bodily re- -by-;engagin 1the under side of the ,end of the flange. 35,]as shown inFig; 3. This projection ventional manner with an upwardly extending" provided for preventing undesiredrelative move- Inentof the cap means 2-3 from its closed position by accidental dislodgment; and=-particularly by accidental relative movement-between the cap means and thercover in a direction axial ofthe V r i1 m jna ticnlarl 'a y net- 'e u i se bat p ei er f h w l Figsn i fcapqmeanscomprises a first-part 24 having a'downwardly projected, substantially cylindrical portion 25, whichis provided with 'one" or more Qutw r 'lrd 'ectecrbb se 26. shbwn Q, such bosses are provided, which cooperate respective v ly with substantially L-shaped bayonet joint-type bi i qr erlqo e fl huscan m 3; may .be seated and held in its closed position .aSShQ'Wn in Fig. 1 by acombined axialand rotative'move mentsta inafrom aiposi't qn f ap me ns at ali nm nt; w th. h e n ra t e t 1. n g tm v v Thebes m a s irshnwn n F s ath be Fla -th fi s ar iia ng i e describss hereinabove. The'partfldjs further prov ed tune-shaped. sbes i hol nii part 24" about the vertica 23. The; purpose of thlfi these't parts of the;

of v anneal,

, 'd oibef 'es c edfw 'i ft e ner nori 'o rmer i'flia iah wn. I' he 1 allsqha i i w ward y e en in an ula 'fi ee 'toqthe-first named pa'rt 24fof the' cap:mea by afsuitable adhesive or any otherappropriate to'bothlabout theaxis of the cap means'23'.

thus serves to limit the vertical upward movement of the cap means" 23. The stem 34, being mounted upon the-rotatable portion 39, also serves as a pivot pintle, permitting therotation ofthe'cap means 23 between a position inalign- I mentwith the reentrantseat 22 and -a position permitting thefilling of the battery cell as shown in 'Fig. 3. This prevents bodily removal and hence-possible loss of the 'cap' means 23 during the nor'mal operation of-the battery. The -bi-' furcation 36} "at the lower end of thestem' 34 permits the assembly 'of 'the parts by permitting the movement 'tOgether-ofg-the"bifurcated lowerend portions-of the'stem 34; so that th'e stem may; bejmoved vertically. downwardly through at en ventio n'provide a nonoverfill the bearing formed in the'fiange -3'5.-- At*thfe same time, if; it becomes necessary, -the fc'ap means may be bodily'removed from the-cover by first pinchingf-together'the lower'orflbiqr a d portions or the stem ,'--the'n-' moving" the cap means bodily verticallyupwardly When lthe-capme'ans 23 is'in its open positiont as seen m Fig. 3, it is desired that the battery may" befilledwith water or el ectrolyte. For

this purpose an aperture 38'is formed communi catmgbetwe'en the' inside of the reentrant'seat and the underside of thecover through a large passage 3th; "Ihis passage 39fis defined laterally by auamiular, but notnece'ssarily'circularj downswardly extending flange lldepending-from and rigid or integral-with the cover 20 A partof the fiangey ifl may also serve as a' partf'off'the flange 35f providing {the bearing for the stem 34?.

s generally set forth above; it"isdesired that the cell cover construction of'the; present in arrangement for hei liri l e T th s t is' e re hat the" levelof {the electrolyte'i'n the -battery? cenbe.

at ab ofit tfl pom-t t if Fig: 3; whichis the level oi; the lower end p'ortionsof the flanges135-and 4 H es to} permit the' esjcape reason venting-means 'mus b e-provided m the cover-or the cap -mearis-"associated"therewith;

us.. nj he' m letedi ap. 1 he pa sifl'" d a i iwit one' n ther. .while the part 3Q is:freelyjrotatablein respect As shown. the cap means 23 in its seated-po sition; Fig. 11; isfso designedian'd dispos'ed ingresp'ectjto.the -reentrant seat-22' as to; provideia space 12 beneath the-cap means and within re;- entrant'seat fit V T'h'isspace, which is maintained in communication-with the space above the elecrtrolytelevel l by passage means j hereinafter described; ispreferably vented to the atmosphere through the cap means. 'Forthispurpose the part -of-the ca means-may bei provided with one or more apertures, 43; communicating'fbetweenthe space '42- andthe interior of the cap The stem 34 may be rigid Orintegralwith the part 30; and the flange 35 may likewise be rigid or integral with the cover 20. 'The lower end of' he cap'means 23 from the cover 20 7 At" the man hait is mcessaryduring; the V.

operation of the "conventionalf a rate. ofgas; -'-For thi's means. This interior spacemay. in turn be ventedtothe atmosphere through one or more apertures 44, two of which are shown, formed in'thetop part.3| of the'cap means. Due to the fact that the aperture 43 is never in vertical alignment with any of the apertures 44, any liquid electrolyte which 'may splash upwardly through the'operture 43 will not be permitted to 'flow or splash outwardly through the .apertures 44, but will run back harmlessly to the interior of the battery-cell. This is assured by the provision of the downwardly extending flange 33, leaving but a small'space 45 between it and the upper surface ofthe flange 29, as shown in Figs. 1 and 3,. -1 v :rThepassage means serving to: vent the .space within the cell to the space 42 during the .normal'operation of the battery comprises a radial slot 345 formed in the flange 35 defining the bearing for the stem 34 and extending from the lower ..end of this flange upwardly substantially to the level of the underside'of the cover 29'. This slot communicates with the space 42, either through an annular groove 41 formed in the stem 34 and located adjacent to the undersideof the cover 20 and the upper end of theslot 46,.as shown in Fig. l, or through a cut-out segment 48 formed in the stem and extending downwardly froma level adjacent to the underside of the cover 2(i.'to a point above the lowerend ofithe flange 35. In either case there is an openthrough passage from thespacefabovethe electrolyte .in thebattery and beneathlthe cover. around the flange 40 to the. space 42, so that .the passages 38 and 39 are not required for venting purposes when the cap means 23- is-in its closed. position. When, however, the cap means 23 is swung to the battery filling .position, Fig. 3, it is necessary to thenon-overfill arrangement that the venting of the spacev above the.electrolyteand'outside the flange 40 be cut off from communication with the atmosphere. For this purpose the stem 34. acts as a valvein addition to its function as .a pivot pintle and serves to obstruct communication between the slot 46 and the atmosphere.

At this position of annular groove 41 the cap means, Fig. 3, the is wholly above the top. end

.of the slot 46, so as to be completely outof com.- munication therewith, and the cut away. segment 48 of the'stem rotated to a position opposite thatof the slot 46. Thus, it is impossible to overfill the battery even though water or electrolyte be added sufficiently to fill the space" 39,

the aperture 38 and the entire reentrant seat 22-.up' to the top of the flange 2|."

further feature of the present invention is the preventing of liquid'displacement by moving the cap -means downwardly into the reentrant seat 22 before the' space above theelectrolyte within the battery is vented to the atmosphere.

Forthis purpose it is desiredthat a venting passage be reestablished solely incident to moveinent-of the cap means to a position in-alignmentwith' thereentrant seat and without requiring vertical movementof the cap means toward the seat. -As will be seen by a comparison of' Figs. 1 and 3, when the cap means 23' is rothe cap means 23 is subsequently depressed .or

moved downwardly to its closed positionshown in Fig.. 1-, no liquid will be displaced thereby and spilled around the outside of the battery. This is important inthe event that the liquid being filled into the battery is corrosive in character, such as sulphuric acid. For this purpose the cut away segment 48 extends to a point as shown in'Fig. 3 where the bottom endthereof will be below the underside of the cover .20. and the upper end of the slot 46 and may be rotated by rotation of the cap means to a position to communicate with the'upper end portion of. the slot 46. In this. connection it will be obvious from the foregoing description that the provision of a slot at 46 is merely a convenient construction, the only necessary requirement, however,

being that there bean aperture. adjacent to the level of the underside of the cover 2-0,.and in a substantially radial direction communicating between the inside of the bearing for the stem. 34 and the spacebeneath the cover 20 and outside the flange 40. .One or more holes in lieu of the slot llilwouldserve this-purpose. .I

From the foregoing it will be obvious that the form of the invention of Fig. 1 secures allthe advantages enumerated above and provides in a single, conveniently unitary structure for the securing of all theseadvantageous functions.

The form of the invention shown in Figs. 4 and 5 difiers from that of Figs. 1 to 3 solely by the provision of difierent means for holding the cap means here shown at 49 to the cover here generally indicated at 50. In this case,'instead of providing a bayonet joint as indicated by the reference characters 26 and'2'l in Figs. 1* to 3, there are provided conventional type molded screw'threads 5| between the outer, part corresponding to the part 24 of the cap'mea'ns 23 and the inner'surface of the flange 2i defining thereentrant seat for the cap means 49. Thus, again the cap means is moved to its'closed' position shown in Fig. 4 from a position above and in vertical' alignment therewith by a combined axial and rotative movement. The remaining portions of the apparatus-of Figs. 4and 5 cor-- a the form of Figs. 1 to 3 and are similarly numtated from the Fig. 3 position aboutthe vertical axis of the stem 34, which is eccentric of and within the seat 22, then the cut away segment -48 'will-' be brought into radial alignment with the slot 46, permitting direct venting to the atmosphere of the portion of the battery outside the flange 40, and hence permittingany liquid or electrolyte within the filling opening to flow bere'd: The functions are substantially the same and will be obvious from the foregoing description and the drawings;

The-form shown in-Figs. '6 and 7 includes a somewhat different construction forthe cap means here generally indicated at 52, which is shown cooperating with a cover generally indicated at 53. The cover 53 may be substantially the same as that shown at 20 in Figs. 1 to 3 and at 50 in- Figs. -4 and 5 with the exception that the means for securing the cap means to the cover comprisescrew threads 51, the same as in Figs. 4 and 5.

substantially Again the cap means is athree part construction, two parts-of which are rotatable in respect -to=thethird part. "In the present instance, however, the part of the cap means 52 provided with the screw threads 5| is indicated at 54 and is per se ro tat'able in respect to the other two partsof the cap means, whichare secured to one another as hereinafter setforth. These other parts comprise a second or under part 55- and a third or upper part56. The under part 5-5 carries the stem 34 rigid or integral therewith, and is arranged to bear against the under surface 51 of the part 54. The upper part 56 is supported upon the upper ends. oft. azseriesz of inwardly di part; 54. The. upper part .iEG has, anannular flange-6G5 depending: therefrom; "the lower edge .portions'of which may be; cemented or otherwise secured: to the underipart55-;ias shQwhZ-atfidl Theg'dimensionsl of. the; flange '60. arerisuchf that thezparts 55. and: 5.6; embraceaportions; of: thepart '54; *but' a manner suchzthat the? part; Bk-may be freely rotated. to; unscrewrth'e capzm'eans from the 'coverr53flwithout rotationgof the parts-55; and 56; which is prevented the eccentricgydispo'sit'ionzor the stem 33'. The cap means: 52: may then: be swung to one side; aboutither axisaof the stem'zfl: in. the; samesway'asethe .cap 2 3:in etheil??i z- V supported, as best-seen-.in Fig:.-6; Thuspthere; is

provided an indirectpassage for- .venting, gases through the cap means 52'from the space 142 therebeneath in' the 'reentran-t seatginthecover 53 asrdescribed for theFigs. 1 to 3 form.

The remaining: parts of-the device arev essentially; similar-to .theform of Fi-gs. 1 to:3;iand the operation essentially theasame, so that: both should be obviousgfromthe foregoing description and'ithe drawings. 7 H v i fgThe form of theinyention' of Figs. B and 9," which isv the presently:preferred form, includes a twoepart cap means generally indicated at '64-, which; cooperates with a coverzgenerally indicated at- 55- by the-provision of screw threads (i6. In thisinstancethe :cap means comprises andi 'a lowerapart 68; The lower part 88- has an outwardly beveledisurface at its outer periphery as indicated at 69 cooperating W-ith a correspond- 'ingly, ;abeveledsurface on the downwardly pro- Jected or skirt portion -'I0-of the upper" part 6'1.

For holding these parts in-assem-bled relation,

' theup'per-partffiifis provided with a downwardly extending j hollowboss: H, whichi is; formed with two 1 ormore. slots IZ'Ttherein and is arranged to through the cap: meansand: inmannerisimilareto. thatzdeseribedxin; connectiomwith previousiioltms or: the invention-,1 particularly by the provision of one; or more apertures? H1 in:; the lower ypar-t 6,8: and:1.8. in the upperrpart: 6;!1 ,These: apertures are: preferablyrso: arranged and disposed: as to be. out :of alignmentwithrone another-while the cap; is. in its; closed position as; shown in.-Fig'.;8: The construction ofjthestem' 34' in theform of the? invention: of Fig. .8 is. substantiallysimilar to thatzshownz'in the, previous figures; ini that itis providedat: its. 1ower en=d with av bifurcation 36,; but this; instance; there is. provided; two

toes orlaterally extended; portions 3]. instead of one as inthe previous figuresz Another slight .difierence: between-the form. of Figs. 8; andi,9 and previous figures .lies in theifa'ct thata radialslot. 19;;which correspondsrgenerally toithe: slot14$ 10f Figs .i-1-'-7;. does not; extend up: wardly; as. far; in theflange 3.5.. Similarly, tthere isilnov annular groove: corresponding to the; groove 41, but. the cutJ-outlsegment 80; Eigs.,,8 and.9, .is provided; corresponding-- to :J the cut-out segment 48; i; and: extending: completely to. the top. of-the stem :to'. communicate with thespacetd'l as shown. These variations. may. sometimes be. desired inn-an actual-":construction,.suoh' as. that; shown. in Figs. 8 'and.9.. r '.,j I r .I'Ihe remainder of" the parts: correspondzstructurally .1 and: functionally; to theisimilzirly numbelted: parts hereinabove: described in connection with the Fig; 1 form-.ofthe invention; .Theoper atiomofthe device" offFigsi. 8 andr'9. shouldinow bev obvious: from; the': foregoing. descriptionaalong witrrthe drawings. v w A desireditunctionpf the form. of; Figs;.8 and-.9

is that i the. upper. part 651' iormsx'a. tight seatfor the; filling openingi during the normal'pperation 4O 7 an upper part- 61 carrying: the-screw thread 6.6

ofithes battery; while: permittingathe; necessary venting of gasesifromitheupperpartthereofr At the samev time alli the; above-enumerated: desirable functions foratdevice ofithepr'esentlinvenreceive a'knobdike'portion 13g formed on the 7 upper end of a stud 1 4 projeoting centrally up.-

; .wardlyi from the lower parttfi ;-The:1nob-like r portion? Bis provided with"aadownwardly di rested-shoulder portion. 15;";Which engages an inwardlyrdirected-fiange "liossmember Hf portion; 'lfi of the hollow I The.- parts.:6land LE8, may beiassienihleditotgether by .pushing theknob portion 137 of the stein Mi into the hollow'part: ofthe boss H until the; inwardly directed. flange portions :16 engage over the shoulder 15... This; ispermitted by the 1 flexing of: the material of the-boss 11'; which in :turn ,is facilitated; by the; provision of the slots 12 The dimensions of the parts; are such- 7 that screwingin of; the cappart fi-Lin movinei hep r-r'n eans to its normally. closed position shown Fig. 8, while rotation of the part 6 8 isprevented 5 by'gtheeccentric dispositionofthe stem. which i is rigid wit-hthepart'GB asin theforms ofthe invention descri'bed above. a

.tion: are preservedin and provided by a: simple structurerforfthecap means havingcliutittwoparts. I

'Turning now to the form ofv invention shown in Figs. 10. an'd ll, there is. provided Ia; cover. gen- 'erally' indicated at 8.1;. with; which cooperates; a oneepieoe cap: means generally "indicated eat; 82. Asrin previous forinsiof the invention. the cover is" provided with anvupwardly. extending flange 8.3 defining a3 reentrant "seat for: asdownwardly projecting portion-generally indicatediat' 84:of.the

cap" means. 82". There is. alsozprovided. a. down:-

:wardly' extendingrflange. 85; which .may be; rigid or integral with thetcover: 81 andwwhichxdefines by; its lower end:- a; level 186. which; is desiredgfor ,theielectroly erofi the associatedrbatterstsa;Within the-flangeBE? is; aithrough, passage 81;- serving as; a fillingsopening forztheobattery and: shownjin the present.-,-instance; as, a; round hole. Eccentric; of the ce 10 the: reen ra l at iSi' 'II. apertu e 8 rme as: c ndr cal h e and e ne 5: bea i f r a do war ly: xten in ho o s e Q6 the part 68 is. made ireely' rotatab le -inrespect to the part6! and vice versa-sozas-to permit the low r i u ated ,end D I l UO the .st mi.. 9 haveoutwardly e end n flan e, on-t einarts flwhiohdnrthepresentinstance serve-a dual f mci n, ni he;;Q1os l;n siti nr fi the can-means sh w ir i liei-v 0,- .the;=toe.-parts; 91;. ar'er sitioned pi l fia e p iqns. 92-nosi ned an e a ed ,part. 93 or. counter-bore which; is aligned with en a h and: in -r si i nt; onta t with. semieanhe; bore 88; The resilientengagement of thetoe parts 9-! beneath; the flange parts 92 serves to hold. the cap; means 82, against accidentaldis- 19 lodgment in-{a vertical direction; anduin' this instance is used; in= place; of the vbayonet joints or .screw threads shown and described inoonnection,

with previous forms of the invention. When the capmeans 82 is moved upwardly, the toe portions 9!, .springing'o'ver the vflanges 92-for this purpose, serve" as positive stops byengagement with a shoulder 94. atthe juncture of the counter-bore L93 and the bore-88. This prevents complete bodily "disengagement of the cap means from the cover means inthe normal use of the device'in the'same manner .as the toe parts 31 engaging the lower end of the ,flange 35-prevent' such bodily disen- Lgagement inprevious forms of the invention.

In the present instance the :indirect venting passage for gasto the atmosphere during normal operation is provided by an elongate slot 95 extending upwardly from: the lower face of the cap means proper and. a bore 96 communicating with one end of the slot 95, at the right as seen in Fig. '10. At the closed position of the cap ;means' 82 on the cover, the opposite (left) 'end "of the slot 95 is in alignmentwitha bore. 91, which :is'. formed in the cover 8| and which communi- "cates :between thewinside of the seat for the cap I means, and particularly with the slot, 95 vat. its upper end; and withthespace beneath the cover .8l around and outside the-flange '85 at its :lower end. Thus when theicap means 82 isin its closed position, asshown in Fig. '10; there is an indirect venting? passage opening irom the. upper portion of thebattery cell through the bore 91, the slot 95am. thebore 96 totheatmosphere. ".li-Theica'p means 82 isalso provided with a sort aof-xsector-shaped' downward projection 38,. best shown viii-Fig. I1, which extends 'below thelevel of the lower part of the projected portion .84 and fits loosely-into a suitable recess formed therefor in the cover 8|. Whenthe;,cap means is raised until the upper end portions of the projections or toes 9| engage the shoulder-94', and then'swung laterally .to a position corresponding toithat shown in Fig. 3, the :projection 98 is thereby raised outof the recess in the cover and swung intoivertical alignment with the bore 91. Dueto thedimensions of the parts, i. e. the specifically -:limited distance which the cap means 82 can be -.raised,lthis projection 98iwil1 bein close valving contact with the upper end of the bore-91, so as to stop'anyventing action thei'ethrough. In this waythe non-overfill' function of the device is preserved; and it is impossibletofill more than the desired amount. of liquid into the battery, so that the level of the electrolyte therein will be preserved at about thelevel 86. Upon again rotating the cap 82 about the eccentric axis of 'the hollow. stem 89, the projection 98 will be swung out of alignment with the bore 91; so'that in this form also the reestablishing of the venting of the battery is effected solely by movement of the cap means into alignment with the reentrantseat and undesired. displacement of liquid is prevented.

While I have shown and described several possible embodiments of the invention and have explained-the principles thereof, other anddifferent embodiments will occur to thoseskilled in the art from the foregoing description and-drawings. I do not wish to be limited, therefore, except by the scope of the appended claims, which are to be'-construed validly as broadly as the state of the prior art permits.

What is claimed is: V a, 11 Acover construction for a storage battery .cell, comprising a cell cover means having a reentrant seat formed therein for a cap means,

a cap means cooperable with said seat and having a portion which is projected axially of "said cap means into saidreentrant seat inthe closed position of said cap means on said cover means,

said cap means and said cover in a direction axial of said cap means, means including'a. downwardly extending annular flange rigid with said I cover means providing a filling opening for said cell communicating with the interior of said reentrant seat, pivot means connecting saidcap means and said cover means providingfor the rotation of said cap meanswith respect to said cover about a vertical axis eccentric of said seat, said pivot means including a stern carried'by one or the two means consisting of said cap means and said cover means and a bearing for said stem formed in the otherof said two means, said stem being axially slidable in said bearing in addition to being rotatable therein, interlocking means between said stem andsaid bearing preventing more thana predetermined relative axial move- 'ment .thereqf to prevent total bodily removal of .said cap means from said cover means'in the normal .use, of the entire construction; an indirect vent passage through said cover construction eifective to ventthe upper portion. of an associatedstorage battery cell when said cap means is in its closed position, said indirectpvent passage. including passage means in said cap meansand passage means insaid cover means communicating with said passage means in said cap means and with the space beneath said cover outside said, downwardly extending annular,

flange atlthe closed'position of said capmeans, means for closing on the venting of the said .spacev outside said annularv flange at the open position of said cap means at which it isvraised out oi .said seat and-swunglaterally about said eccentric axis, and means responsive to the swinging of said cap means about said eccentric axis to a position in alignment with-saidseat,

and independent of any vertical a movement of said cap means toward said seat for establishing a venting. connection through at least a partrof said indirect ventpassage between said space ;outside said annular flange and the atmosphere outside the storage battery cell.

2. A cover construction for a storage battery cell, comprising a cell cover having a reentrant seat formed therein for a cap means, a cap means cooperable with-said seat and havinga portion which is projected axially of said cap means into said reentrant seat in the closed position of said cap means onsaid cover, means for preventing accidental dislodgment of said cap means in said closed position by preventing accidental relative movement between said cap means and said cover in a direction axial of said cap means, means including a downwardly extending annular flange rigid with said cover providing a filling opening for said cell communicating with the interior of said reentrant seat, pivot means connecting said cap means and said cover providing for the rotation of said cap means with respect to said cover about a vertical axis eccentric of sa'id seat, said pivot means including a stem carable in said bearing, interlocking means between V I 1.21:1 said stem 'andgsaid bearing preventing more than .a;predeterminedgrelative;axial movementthereof to preventtotal lbodilyremovalzof saidrcap means irom said cover :in thezno'rmal :use ':of the entire construction; :an indirect vent passage :through said ;,cover' construction effective .to,--vent=-;the .uppergportion 'of an associated: storage battery cell when said cap means is in its closed position, :said indirect yent passage including passage means in said-cap means and passage means in said ;cover ,-com municating with said passage rneans inTsaid cap'meansnand with the space a h e neath said; cover outside said downwardly' extending annular; flange at the closed position of said cap: ineansmeansforclosing offsthe venting act the said space outside said annular flange at 7 he open p ositionof said cap means at which it 1 .rais'ea lou't .ofsaid seat and swung laterally about said eccentric axis, and meansresponsive Qtplthe swinging ,of said cap means about said .e ,entr'ic .axis .to .a position .in alignment with ."saidlseat, and: independentof any vertical moveamaze -cover abouta v tic'al 'axisseccentriczofrsaidiseat,

' said pivot 'rmeans including-fa i stem cairrie'd-x-zby .ment ofsaid-cap :means towards said seat, for V establishing 'a ,v entin'g connection through at 'l leasta part of said Vindirectventpassage between I ,saichjspace outside saidfahnular flange-and the atmosphere outside'the storage battery cell. 7 5

'3; Acover construction for storage battery. cell said cap rmeansl'and bearingiifo'rmed' .=in"sai'd icover'means' for receiving said stem .in af way zsuchvthatisaid stem is :rlotatableiand Iaxiallys'movable am said ib'earing, said i'stemhaving a bifiii' 'cated'flower-s'endqand being-rot material such that :the bifurcated end portions of the; stem'iniayiiiie resiliently zflexed 'ltowardi'one another, iaiitoe ion ztheien'cl of-tat :least fonet'ofzsaid bifurcatedliporf "tion's arranged *to: cooperate *withtaxiiart :of said bearing preventing relative izmove'ment .rof csaid' Iclosin'g off the veiiting' df theisa'id'asp'ace ioutside sen; annular flange it the 'penrpositi'onsofzsaid cap me'ans i when i .isjiraisediout offsaid :seat "and swung laterally about Tf'said' :eccentric' ra-xis, and

in accordance with claiml; Whereinsaid means for preventing accidental dislodgment in said 'ca-p means comprises screw threads onsaid cap .jmeansjand in said seat arranged for engagement 'withfjpnfle another. v r '4 "Acove r construction for storage battery cell .in'a ccoirdancej with claim'l, wherein saidlme anjs T; fforpreventingaccidental 'dislodgment of said cap means comprises'gat'jleastonej boss on said @1 5 means "extending fout'ward therefrom" and zengaginga bayonet'slottforrned in said reentrant seat. l ;5;.1A1'co.ver construction for storage battery 11' in accordance withl claim 1, whereinsaid cans *for preventing accidental dislodgement of "saidcap means comprises cooperating members arr-said stem and said bearing including "a bifur- 'cated end portion of said stem, at least one of the bifurcations having an outwardly dire'cte'd toe p'ort'ion, and an inwardly directed 'ribiormed insideapart of said bearing and cooperable with 'sa'id toe portion ofsaid stem, whereby-the bifur- 'cation o'f'said stem permits a resilient movement of the bifurcations thereof, so that the stem "may -'be assembled within said bearing, and whereby the toe portion of said stem may -resilientlvengagesaid inwardly directed rib and may be-flexed to move over it incident tothe movement of saidrcap means to and from its closed position on said cover means. i a 6. A-cover construction for a storage battery :cell', comprising a cell cover having a reentrant ise'at formed therein for a; capmeans, a cap means -"c ooperahle with said seat and having a portion which is projected axially of said cap means into 'saidzreentrant seat in the closed position of said :c'ap'means 'onsaid cover, means for'preventing (accidentaldislodgment of said cap means in said closed position bypreventing accidental relative :moiv'ement between'said cap meansandsaid cover 'inqa direction axial of said :cap means, means jincludinga downwardlyextending annular-flange rigid "Withsaidcover providing a filling opening rforisaid cell communicating-with the interior of rsaidsreentrant seat,:pivotmeans connecting; said 1 .cap :means :and Y said cover providing for rthe 'ro- ;tation of-:said cap means with respect to said means responsiveta ':the swinging of .c "said c-ap means. about said eccentricraxis' to 2a ;position':in vertical I a-lignmenttwith isaid seat, and independ- -ent o'f any vertical i' m oyement of said ica'pimea'ins toward said seat,":jfor 'iestalilishingiazventmge' connection ithrlough .at least -storagefoattery clfi' l i "'7'. .i i' cover-onstruction 'r -a,-'.'storage"sbattery cen', co'r'np'r-ising ia zcell l-coverhaving' 2a areentrant "seat "formed thereinfor :a :cap means; I a" icap :means :cooperable with' said c-seatiianjd :having ia portion which :is -projected "axially "of said cap annular flange .an'd t'he; atmosphere :outsi'cle ithe "mean'sintoisaid'. reentrant seat in thelclosediposition of .zsa'idzcap means on said' cover, :means :for preventing 'saccidental "dislodgment of '-'.=said c'ap irriean'sin:saidplosediposition by preventin'gracidental relative :movement 'ibetwee'n 'i-salidrc'ap rm'eans andrsai'dicover in a *direction' axial of said icap means; :mean's including '73, downwardly Tex 'itending annular Tfiange .rigid withi saidsicover providing-EaWfiIIin-g' opening for said :cell. communieating"with ':the interior 50f :said ree'ntrant seat, pivotznieaias:conneetingsaid .capz-means and said :c'over providing *for the rotation .of said :cap means withrespect to TSEiidCCOVGI a'boutiaivertical 'ax'is :eccentric of said rseat, :s'aid pivot fmeans' 2in- "eluding :afstemcarried :by said cap rm'eansiand 1a :bearing'lformedainzsaidvicover iorirece'iving said ."stem ini a way such that i said stem" is rotatable rand axiallyrmovable in :"said fbearing, said bearing including a:downwariily"extending annular-flange rigid with: said cover,finterlocking :means between said stem and a lower portion of the flange 'of said bearing preventing more than a predetermined rjelati ve axialtmovement thereof-to preven t total *bodily removal for said cap *means from' said cover in :the :normal *use of the entire construction;- anzindirect' vent :passage ;.in said cap mean's 'between the underside thereof and theatmosphere outside :said' cap means "through "which :gases-smay'be :vented from insidesaid -cell when said cap means is in said closed 'rposition on said cover, a passage through .one'-'side of the flange said I I :part'zo'f'fsaidiindirect i went 1 passage between' saidspace I :outsiiie rsaid tioned opposite the last named passage when said cap means is in its closed position and forming a part of a venting passage to the underside of said cap means in said closed position thereof, and a cut-away segment of said stem communicating between said cut-away portion and a zone along said stem opposite said last named passage when said cap means is raised in respect to said cover but is in alignment with said seat, a part of said stem other than said cut-away segment and said cut-away portion serving as a valve to close said last named passage when said cap means is rotated about said eccentricaxis to a cell-filling position, whereby venting of the upper portion of said cell beneath said cover is prevented when said cap means is swung to its cellfilling position about said eccentric axis and a venting passage between the upper portion of said cell and the atmosphere is opened solely by rotating'said cap means about said eccentric axis to a position in vertical alignment with said seat.

8. A cover construction for a storage battery cell in accordance with claim 7, wherein said last named passage'is formed as a radial slot extending from the lower end of the flange of said bearing to a point adjacent to the underside of said cover, wherein said cut-away portion of said stem is an annular groove formed in said stem at a level below the upper end of said slot atthe' closed position of said cap means on said cover, wherein said seat is formed to provide a space at the lower end thereof at the closed position of said cap means, which space extends from azone in communication with said annular groove across the'underside of said cap means and communicates with said indirect vent passage in said cap means, and wherein said cutaway segment'of said stem extends from said annular groove toward the lower end of said -stem a distance substantially less than the vertical extent'ofs'aid radial slot. a 9. A cover construction for a storage battery cell, comprising a cell cover having'a reentrant seat formed therein for a cap means, a cap, means having all portions rigid with one another and cooperable with saidseat, said cap means having a portion which is projected axially thereof into said-reentrant seat in the closed position of said cap means on said cover, means including a downwardly extending annular flange rigid with said cover providing a filling opening for said seat communicating with the interior thereof, pivot means connecting said cap means and said cover providing for the rotation of said cap means with respect to said cover about a vertical axis eccentric of said seat, said pivot means including a bifurcated stem'carried' by said cap' meansand 'abearing' formed in saidcover means for're'ceiving said stem, said stern and 'saidbearing being constructedand arranged so th'atsaid 'cap'is rotatable and axially movable in said hearing, at least one outwardly extended toe portion on said stem,;'a shoulder forming a part "of said bearing] cooperable with said toe "portion for limiting thevertical upward movement of said cap means, detent means cooperating with said stem and said toe portion thereof for resiliently preventing accidental dislodgment of said cap means from'said cover in the normal use of the cover construction, and an indirect vent passage for venting'said-battery cell when said cap means is atsai'd closed positionincludinga passage through said'cover outside said downwardly extending annular flange and communicating be tween the underside of said cover anda point within said reentrant seat, and passage means in'said cap means having a portion aligned with the passage in said cover at the closed position of said cap means and a communicating portion of said passage means out of alignment with the passage in said cover means but communicating therewith and with the atmosphere when said cap means is in its closed position; and a valve means formed rigid with said cap means and arranged to be disposed in vertical alignment with the passage in said cover for closing it when said cap means is rotated about the axis of said stem to a position for the filling of the associated battery cell.

10. A cover construction for a storage battery cell, comprising a cell cover having a reentrant seat formed therein for a cap means, a two-part cap means cooperable with said seat including an upper part having a portion which is projected axially of said cap means into said re-' entrant seat in'the' closed position of said cap means on said cover, means including interengaging portions of said seat and said projected portion of said cap means for preventing accidental dislodgement of said cap means from'said cover,'said cap means being movablefrom said closed position to a cell filling position by a combined rotative movement and axial movement of saidupper'part in respect to said cover, means including a downwardly extending annular flange rigid'with said cover providing a filling opening for said cell communicating with the interior of said reentrant seat,-pivot means connecting said cap means with said cover providing for the rotation of saidcap means with respect to said cover about a vertical axis within and eccentric of said seat, s'aid' pivot means including a lower part of said cap means which is freely rotatable in respect'to said upper 'part thereof about an axis concentric with said seat in'the closed position of said cap means, means secu-r ing the upper and lower parts'of said cap means against bodily removal from-one another while permitting free relative rotation-therebetween; a stem rigid with said lower part, -a 'bearing' formed in said cover for receiving said 'ste'm 'in a way such that said stem is rotatable and axially movable in said bearing, cooperating meanscarried by said bearing" and said stem for limiting movement of said cap means vertically away from saidgcover, said seat and said cap means being so constructed and arranged to provide a space within said sefat. below said cap means at the closed position of said vcap means, indirect passage'means formed in'said upper and lower parts of said cap means for ventingsaid space to the atmosphere when said cap means is in itsjclosed position, and valve means formed in part by said bearing andin part by said'stem for providing an open venting passage to said space from the interior of said cell outside said downwardly extending annular flange when said cap means isinits 'closedppsition and for closing said venting passage, when said cap means is raised and rotated about lthe axis of: said stem for filling'said cell, said-valve.

means being moved to a cell-venting position solely by rotation of said cap means to a'positio'n in alignment with said seat and; being independ ent of-verticalmovement of said cap 'meansinto said seat. t

1 1. A cover construction for a storage-battery cell inaccordance with claim 10, whereinsaid upper pa t0? s i a means nedza a i gt sria' ed memberhavingian annular wall which-is arrangedfor" engagement with" said reentrant seat; aslotted'ihollow'boss"rigid'with said cupshaped member'depending downwardly central ly thereof', and wherein said-lower partof' said cap means includes 'an .upwardly" directed stud rigid: therewith and arranged to beloosely. re-

ceived in said slotted hollow boss, said slotted means for said cover comprises screw threads molded on'tlieoutside periphery of said projected portion of said-upper part of saidcap means and cooperating screw threads molded in said reentrantseat of said cover.

13; A cover construction for a'storage battery cell in accordance with claim 10, wherein said nieansincluding inter-engaging portions of said seat and said projectedportion of said cap means for preventing accidental dislodgment of said cap" means from said cover comprises screw threads molded on the outside periphery of said projected portion of said upper part of said cap means and cooperating screw threads molded in 7 said reentrant seat of said cover, wherein said stemrha's a lower bifurcated end portion and has atleast one of'its bifurcated end portions pro- 'videdwith a laterally extending toe, and wherein said bearing is formed in part within a downwardly. extending annular flange of such dimens-iqnsiin respect to the length ofsaid stern and so disposed in respect to said toe that upon upward movement ofsaid stem in said bearing, said toe wlllengagethe lower end ofthe flange of said bearing to limit axial movement of saidcap means vertically away fromsaid cover, said annular flange of said bearing being provided with-aradial 1 slot extending upwardly from the lower endthereof, andsaid stem having a cutaway segment extending downwardly toward, but stopping short'of, the lower end thereof and positioned to be in radial alignment withv said slot: when said cap means is vertically aligned with said seat, said slot and said cut-away seg,- ment forming parts of' said-venting passage for venting the upper 'portion' of said cell when said cap means is in its closed position. 7

14. A cover construction for a storage battery cell, comprising acell cover having a reentrant seat formed therein for a cap means, a cap, means 7 having threeparts; two of which are secured to getherandare freely rotatable in respect to the third, cooperating with said seat, said cap means including one part having a substantially cylindrical portion which is projected axially of said cap means into said'reentrant seat in the closed position of said cap means on said cover, means including inter-engaging portions on said one parfl'andisaid seat forrpreventing accidental dislodg'ment of said cap means from said cover, said cap means'being movable'fromsaid closed position to a cell-filling position by a combined rotativej and axial movement of said one part in respect to} said cover, one part of said cap fieerela ti've rotation between said third part on 16 the" one hand and theother two parts on the other, means'includinga downwardly extendingaannular flange rigidwith said cover providing a filling opening for said cell communicatingwith the interiorof said reentrant seat, pivot means connecting said cap means with said cover providing for the rotation of said cap means with respect to said cover about-a vertical axis within and eccentric of said seat said pivot means including a stem rigid with a freely'rotatable part of said cap means, a bearing formed in said cover for receiving said stem in a way such that said stem is rotatable and axially movable in said bearing, cooperating means car- ;riedby said bearing and said stem for limiting viding an open venting passage to said space.

from the interior of said cell outside said annular flange when said capmeans is in its closed position and for closing said; venting passage when said cap means is raised and-rotated about the axis of said stem for filling said cell, said valvemeans being moved to a cell-venting position solely by rotation of said cap means-to a position in alignment with said seat and being independent of vertical movement of said cap means into said seat-J I 15. A cover construction for a storage battery cell in accordance with claim 14,; wherein said cap means comprisesas its three parts an outer part having inter-engaging portions cooperating with mating-inter-engaging portions of 'said seat, said outer part including an-upwardly directed annular shoulder, wherein a second part of said cap means includes an outwardly extending flange rotatably seated uponsaidshoulder, and wherein the third part of said cap means is secured to the first-named part andhas a portion disposed above said outwardly extending flange of said second part so as to confine saidsecond part against substantial movement axially of said cap means while permitting free rotation thereof about the axis of said cap means. I 16. 'A cover construction for a storage battery cell, comprising a cell cover means havinga screw threaded reentrant seat formedtherein for a" cap means a cap means cooperable with Said seat and having a screw threaded portionwhich is projected axially of said cap means and threaded into saidlreentrant' seat in the closed catingl with the interior of, said reentrant seat,

I verticalaxis eccentric of said seat, said pivot me'ans being secured rigidly to another of the parts thereofto confine the third of said parts the'rebetweenin a manner providing for pivot means connecting said cap means and said cover means providing for the rotation of said cap means with respect to said cover'about a means including a stem carried by 'saidfcap meansand a bearing for said stem formed in said cover means, said stem being axially slida'ble 'in said bearing in addition to being rotatable therein, interlocking means between said stem and said bearing'preventing moretlian a predetermined relative axial' movemen't thereof to prevent total bodily' removal of said cap means from said cover means in the normal useof'the 17 s entire construction; an indirect vent passage through said cover construction effective to vent the upper portion of an associated storage bat tery cell when said cap means is in its closed position, said indirect vent passage including passage means in said cap means and passage means in said cover means communicating with said passage means in said cap means and with the space beneath said cover outside said downwardly extending annular flange at the closed position of said cap means, and means for closing 011 the venting of the said space outside said annular flange at the open position of said 0 cap means at which it is raised out of said seat and swung laterally about said eccentric axis.

ROLAND REPPERTV REFERENCES CITED The following references are of record in'the file of this patent:

f UNITED STATES PATENTS Number Number Name Date Land June 11, 1918 Foltis Feb. 19, 1929 Dudley June 27, 1933 Winger Jan. 1, 1935 Smith Oct. 29, 1940 Sandusky Nov. 24, 1942 Sandusky Nov. 24, 1942 Keller Apr. 11, 1944 Doughty May 9, 1950 FOREIGN PATENTS Country Date Great Britain July 2, 1920 France Jan. 2, 1940 

